#include <iostream>
using namespace std;

class Rectangle {
	int width, height;
public:
	Rectangle();
	Rectangle(int x, int y) : width(x), height(y){}
	int area() { return width * height; }
};

void printf(Rectangle param)
{
	//cout << param.width << '\n'; loi bien width khong truy cap ngoai lop.
	//cout << param.height << '\n'; loi bien height khong truy cap ngoai lop.
}
